Well, .... there's two of them, uh.... they have curvy wiggly things on top, and uh... when you pull the little bar down all the curvy things move at the same time. And oh yeah! the webbing on them is different colours. They must be mine. :)

Whoo Hoo! Found it. In the Holy Word of Gordie Smaill, Book of Apron, Page 74, Paragraph 2:

Amphitheatre
first ascent: Tony Ellis and Glenn Woodsworth 1965
time: four hours
5.3 A2
Arrive on the Stage via Gringo a-go-go or Snake. Start off the left side and free to the overhangs above. Nail the leaning corner above to a hanging station on steep slabs. Work up and right to the final overhanging corner. Hammer up it to easy slabs above.
equipment: Knife blades up to one inch.

Amphitheatre and Gringo are entirely separate lines. They cross each other, but otherwise are completely different. Both are very old school. No power drill rap bolting on either route. No wussy cleaning either! :)